Spare part hot-dip galvanizing process

Abstract

The invention discloses a hot-dip galvanizing process for loose parts, which includes carbonization and degreasing steps: hot forgings are carbonized and degreased by waste heat insulation, and cold parts are carbonized and degreased by continuous carbonization furnace or gas flame combustion; shot blasting cleaning steps: Carry out shot blasting to remove the scale on the surface of the workpiece; heating hydrogen reduction step: send the workpiece into the reduction reaction channel, and under the protection of the reducing atmosphere gas, heat the workpiece to raise the surface temperature to above 600°C, so that The oxide layer on the surface of the workpiece undergoes a reduction reaction; the immersion plating step: the workpiece is sent through the outlet of the reduction reaction channel into a container filled with zinc liquid for immersion plating, and the temperature of the zinc liquid is 420‑580 °C. The present invention can reduce the production process, avoid pickling, alkali washing, immersion in flux, drying after immersion in flux, immersion in zinc with flux, serious pollution links and subsequent treatment of waste liquid, waste water, and waste gas, reducing Reduce energy consumption, reduce pollution, greatly reduce labor costs and equipment costs, and improve production efficiency.

Description

technical field [0001] The invention relates to a galvanizing process, in particular to a hot-dip galvanizing process for loose parts. Background technique [0002] Hot-dip galvanizing is to immerse the rust-removed steel components in a zinc solution that melts at a high temperature of about 500 ° C, so that the surface of the steel components is attached with a zinc layer, thereby achieving the purpose of anti-corrosion. Because of its long durability and stable quality, it is widely used in outdoor steel structures that are severely corroded by the atmosphere and difficult to maintain, such as a large number of transmission towers, communication towers, and components with high corrosion resistance requirements. In recent years, a large number of light steel structure systems, steel plates for automobiles, and various parts and components are also widely used for anti-corrosion, and they are playing an increasingly important role in anti-corrosion protection. [0003] At...

AI Technical Summary

Problems solved by technology

[0003] At present, the hot-dip galvanizing process in the prior art includes steps such as alkali washing and degreasing + water washing + pickling and rust removal + water washing + fluxing (dipping zinc ammonium chloride fluxing agent) + drying + dipping, in order to remove parts Oil stains, rust layers, and oxide layers on the surface, and to improve the state of the zinc liquid, use alkaline cleaning to remove oil, pickling to remove rust, cleaning, zinc chloride and ammonium-assisted plating and other chemical treatment links in the entire process, and there are the following problems: The process route is complicated, the production cost is high, and serious environmental protection problems inevitably arise, and the cost of environmental protection treatment is high